Real Time Devices DM6804 Counter PWM & ARM

DM6804 Counter PWM & ARM block (not recommended)

Library

Simulink® Real-Time™ Library of Drivers No
Longer Recommended for Use

Note

The DM6804 has one AM9513A chip with 5 counters.

The DM6804 PWM & ARM driver programs the AM9513A for PWM
or disarmed signal generation (a square wave with fixed frequency
and variable duty cycle). Additionally the driver allows to arm and
disarm the counter by the second block input. For the corresponding
counter channel, the PWM signal is output at the pin named OUT.

Scaling Input to Output

Hardware Output

Block
Input Data Type

Scaling

TTL

Duty cycle: Double Arm: Double

0 to 1 <0.5 disarmed ≥0.5
armed

Block Parameters

Counter

From the list, choose 1, 2, 3, 4,
or 5 to select which counter is used with this
driver block. One block is required for each counter used.

Frequency base

From the list, choose F1=5MHz, F2=500kHz, F3=50kHz, F4=5kHz,
or F5=500Hz to set the base frequency.

Relative output frequency

Enter a value between 0 and 0.25.
The Relative output frequency is multiplied by
the Frequency base to set the fixed output frequency
of the PWM-signal.

For example, if the output frequency of a square wave has to
be 87.5 kHz, then choose F2=500kHz as the Frequency
base and enter 0.175 as the Relative
output frequency. 500 kHz x 0.175 = 87.5 kHz

Level sequence of square wave

From the list, choose either high-low or low-high:

If you choose high-low, the square
wave period starts with the TTL high part followed by the TTL low
part.

If you choose low-high, the square
wave period starts with the TTL low part followed by the TTL high
part.

In either case, the duty cycle entering the block defines the
duration of the TTL high part.

Level when disarmed

From the list, choose either high or low.
The counter is automatically disarmed when the real-time application
is not running. If the application is running, the second input port
controls whether the counter is armed or disarmed. This parameter
sets the TTL level when the counter is disarmed.

Sample time

Enter the base sample time or a multiple of the base sample
time. The sample time indicates the update rate of registration on
the input (Duty Cycle)

Base address

Enter the base address of the board. This entry must correspond
to the DIP switch setting on the board. For example, if the DIP switch
setting is 300 (hexadecimal), enter 0x300.

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